State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China.
ChemSusChem. 2020 Jan 19;13(2):341-350. doi: 10.1002/cssc.201902952. Epub 2019 Dec 10.
The rapid growth of CO emissions, especially from power plants, has led to the urgent need to directly capture and fix CO in the flue gas after simple purification rather than energy-intensive gas separation. Herein, imidazolium-functionalized ionic hypercrosslinked porous polymers (HCPs) bearing adjustable surface groups were straightforwardly synthesized through co-hypercrosslinking of benzylimidazole salts and crosslinker through Friedel-Crafts alkylation. Abundant microporosity and relatively high ionic moieties were obtainable in the ethyl-group-tethered ionic HCP, giving a remarkably selective CO capture performance with a CO uptake of 3.05 mmol g and an ideal adsorbed solution theory (IAST) CO /N selectivity as high as 363 (273 K, 1 bar). This ionic polymer demonstrated high efficiency in the synthesis of cyclic carbonates from the coupling of various epoxides with the simulated flue gas (15 % CO and 85 % N ), giving high yields, large turnover numbers (up to 4800), and stable reusability under additive- and solvent-free conditions.
CO 排放量的迅速增长，尤其是来自发电厂的 CO 排放量的增长，使得人们迫切需要在简单净化后直接从烟道气中捕获和固定 CO，而不是采用能源密集型的气体分离方法。在此，通过苯并咪唑盐和交联剂的 Friedel-Crafts 烷基化反应，直接合成了具有可调表面基团的功能化离子超交联多孔聚合物（HCP）。在带有乙基侧链的离子 HCP 中，可以获得丰富的微孔和相对较高的离子基团，从而表现出出色的 CO 选择性捕集性能，CO 吸附量为 3.05 mmol·g，理想吸附溶液理论（IAST）CO/N 选择性高达 363（273 K，1 bar）。该离子聚合物在模拟烟道气（15% CO 和 85% N）中通过各种环氧化物的偶联合成环状碳酸酯时效率很高，在无添加剂和无溶剂的条件下，它具有高收率、大周转数（高达 4800）和稳定的可重复使用性。
